<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types/data';
import { onBeforeMount, onMounted, ref ,onBeforeUnmount} from 'vue';
const active = ref(1)


const hNext= ()=>{
  active.value++
  if(active.value === slides.length){
    active.value = 0
  }
}

const hPrev = ()=>{
  active.value--
  if(active.value<0){
    active.value = slides.length - 1
  }
}

 const {slides,autoPlay=false,duration=3000} = defineProps<{
  slides:BannerItem[],
  autoPlay?:Boolean,
  duration?:number
  }>()

onMounted(()=>{
  start()
})
onBeforeUnmount(()=>{
  stop()
})
let timer = -1
const start = ()=>{
  if(autoPlay){
    timer = window.setInterval(()=>{
      hNext()
    },duration)
  }
}

const stop = () => {
  clearInterval(timer)
}
</script>
  <!-- 轮播图 -->
<template>
  <div class="xtx-carousel" @mouseleave="start()" @mouseenter="stop()">
    <ul class="carousel-body">
      <li class="carousel-item" :class="{fade:active===index}" v-for="(item,index) in slides" :key="item.id" >
        <RouterLink :to="item.hrefUrl">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="hPrev()">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <a href="javascript:;" class="carousel-btn next" @click="hNext()">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <div class="carousel-indicator">
      <span v-for="(item,index) in slides" :key="item.id" :class="{active:active===index}" @mouseenter="active = index"></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>